Abstract
The power spectra of the internal forces in a vehicle running on an uneven road are investigated based on finite element modeling. The modeling is two-dimensional to treat the random excitations through the front and rear wheels. The damping of the suspensions and tyres is of a non-proportional type. The equation of motion is uncoupled by use of the complex eigenvalue problem. An attempt is made to apply the filtered Poisson process (FPP) to the simulation of a random road surface. The power spectrum generated by the FPP can simulate well the one published as ISO DP 8608 when the parameters are selected properly. The power spectrum of a spring reaction is evaluated regarding the effect of vehicle speed, the sensitivity of the spring constant and the deviation caused by uncertain damping, together with that of the bending moment in the model beam.
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